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Chemical Reactions

Chemical Reactions unit test review - CMS - Ms. Counts

QuestionAnswer
If glycerin has a higher density than water, will it sink or float? Sink
If ammonia has a lower density than water, will it sink or float? Float
Substances were combined in beakers. In beaker 1 there was no color change, no solid formed, & there are no bubbles. In beaker 2 there was a color change, a solid formed, bubbles formed, & a gas produced. Which beaker shows a chemical reaction? Beaker 2
If zinc and sulfur are combined to form zinc sulfide and a color change happened, is this an indication that a chemical reaction was formed? Yes
Students at a bonfire noticed a large amount of gas and ash were produced as logs of wood burn. How can you explain what type of reaction this is? This is a chemical reaction because the atoms in the wood react with oxygen and rearrange to form new combinations of atoms and molecules
Matter can change its form but ___________ the mass must stay the same
Which compounds represent products in this equation: HCl + ClO -> 2Cl + OH 2Cl and OH
Is iron rusting a chemical or physical change? chemical change
Is water boiling a chemical or physical change? physical change
Is sugar dissolving a chemical or physical change? physical change
Is eggs cooking a chemical or physical change? chemical change
Is the following equation balanced or unbalanced? 4P + 3Br -> 2PBr Unbalanced
Is the following equation balanced or unbalanced? 2H + 2Cl -> 2HCl Balanced
What law states that atoms cannot be created or destroyed, only rearranged Law of conservation of mass
What are the tiny particles that make up matter? atoms
What is a common sign that a chemical change has occurred? A color change
What are the 3 states of matter? solid, liquid, gas
How many total atoms are in the reactants? 2H + 2Cl -> 2HCl 4
How many total atoms are in the products? HCl + ClO -> 2Cl + OH 3
For a chemical reaction in a closed system, mass cannot be _______ or ________. We can say that throughout the reaction mass is _____________. created; destroyed; conserved
What is a characteristic of a substance that doesn't change? Property
Small golden flakes are removed from a water solution by filtering the solution. Is this a physical or chemical change? Physical
Lacie dropped an ice cube in her coffee and the ice cube melted. Which way does the energy transfer between the ice cube and the coffee? Heat from the coffee transferred into the coffee, melting the ice
If you don't touch a marshmallow to a campfire flame, the marshmallow can still be roasted. Why does this happen? Heat radiates from the fire and cooks the marshmallow
Wood and oxygen are commonly burned at campfires, and all that's leftover is ash and char. Would the mass increase, decrease, or remain the same? the total mass of the reaction stays the same, but mass leaves the wood as smoke
The original substances in a chemical reaction are called _______________ and the new substances created are called _________________ Reactants; products
What is the process that produces chemical change, resulting in new substances that have properties different from those of the original substance? Chemical reaction
Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What is his independent variable? Temperature of the water
Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What is his dependent variable? How long the bath bomb takes to dissolve
Rob set up the following experiment: He dropped identical blue bath bombs into a 100 mL of cold water & 100 mL of hot water, put an identical thermometer in each, observed them for 10 min & took observations every 2 min. What are his control variables? 100 mL of water, identical thermometers, and recording the observations every 2 minutes
Created by: HaleyCounts
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